1. When no one was looking he took a surreptitious puff on his cigarette.
    当没有人看时，他偷偷地抽了一口烟。

1. 秘密,偷盗的：surrender 投降,降服 | surreptitious 秘密,偷盗的 | surround 包围

2. 秘密的：surrender 交出 | surreptitious 秘密的 | surreptitiously 秘密地

3. 鬼鬼祟祟的：rept爬(根) | surreptitious鬼鬼祟祟的 | repugnant令人厌恶的

4. 鬼鬼祟祟的,保密的：sunder 分裂,分离 | surreptitious 鬼鬼祟祟的,保密的 | sycophant 马屁精

1. 秘密的;鬼鬼祟祟的;偷偷摸摸的
    A surreptitious action is done secretly.

    e.g. He made a surreptitious entrance to the club through the little door in the brick wall...
           他从砖墙的小门偷偷进入俱乐部。
    e.g. They had several surreptitious conversations.
           他们有过几次秘密会谈。

1. conducted with or marked by hidden aims or methods

    e.g. clandestine intelligence operations
           cloak-and-dagger activities behind enemy lines
           hole-and-corner intrigue
           secret missions
           a secret agent
           secret sales of arms
           surreptitious mobilization of troops
           an undercover investigation
           underground resistance

    Synonym: clandestinecloak-and-daggerhole-and-corner(a)hugger-muggerhush-hushsecretundercoverunderground

2. marked by quiet and caution and secrecy
    taking pains to avoid being observed

    e.g. a furtive manner
           a sneak attack
           stealthy footsteps
           a surreptitious glance at his watch

    Synonym: furtivesneak(a)sneakystealthy